update headers

ios/include/matdbg/ShaderReplacer.h

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+/*
+ * Copyright (C) 2019 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef MATDBG_SHADERREPLACER_H
+#define MATDBG_SHADERREPLACER_H
+
+#include <filaflat/ChunkContainer.h>
+
+#include <backend/DriverEnums.h>
+#include "private/filament/Variant.h"
+
+namespace filament {
+namespace matdbg {
+
+// ShaderReplacer is a utility class for replacing shader source within a material package. It works
+// in a manner similar to ShaderExtractor.
+class ShaderReplacer {
+public:
+    ShaderReplacer(backend::Backend backend, const void* data, size_t size);
+    ~ShaderReplacer();
+    bool replaceShaderSource(backend::ShaderModel shaderModel, Variant variant,
+            backend::ShaderStage stage, const char* sourceString, size_t stringLength);
+    const uint8_t* getEditedPackage() const;
+    size_t getEditedSize() const;
+private:
+    bool replaceSpirv(backend::ShaderModel shaderModel, Variant variant,
+            backend::ShaderStage stage, const char* source, size_t sourceLength);
+    const backend::Backend mBackend;
+    filaflat::ChunkContainer mOriginalPackage;
+    filaflat::ChunkContainer* mEditedPackage = nullptr;
+    filamat::ChunkType mMaterialTag = filamat::ChunkType::Unknown;
+    filamat::ChunkType mDictionaryTag = filamat::ChunkType::Unknown;
+};
+
+} // namespace matdbg
+} // namespace filament
+
+#endif  // MATDBG_SHADERREPLACER_H